I changed my battery last week. Got it from the dealership as I wasn't satisfied with what I was finding online and, as someone said above, it was well in the range of the other options. They will charge you an extra 20 bucks as a deposit to make sure you bring the old battery back, but I bought the battery in October and took it back last week.
My F30 is a 2013 model built in 2012 and it still had the original battery (bought it a few months ago), which also convinced me of getting OEM. The original battery was 90Ah, the new one 92Ah. I programmed it with Carly's.
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